#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
bool comp(const int a, const int b)
{
	return a > b;
}
int main()
{
	vector<int>v1 = { 4,5,6 };
	auto it = v1.begin();
	v1.insert(it,1);

	cout << v1[0];
	return 0;
}